1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Supporting mods to run 37s offroad

Discussion in '3rd Gen Tundras (2014+)' started by L3TT3RS, Oct 11, 2018 at 8:23 PM.

  1. Oct 11, 2018 at 8:23 PM
    #1
    L3TT3RS

    L3TT3RS [OP] New Member

    Joined:
    Sep 14, 2018
    Member:
    #19408
    Messages:
    52
    Gender:
    Male
    First Name:
    Taylor
    Vehicle:
    19 cement sr5 crewmax
    Fox 2.5 resi. 35s. Coachbuilder.
    I've done a bit of searching and see that most recommend swapping to 4.88 gearing to run 37s.

    My question is, other than gears with cmc, some trimming, and suspension lift, are there other supporting mods necessary to run 37s without breaking stuff for moderate offroad?
     
  2. Oct 11, 2018 at 8:41 PM
    #2
    zcarpenter92

    zcarpenter92 Yotas, Coronas and 'Merica

    Joined:
    Feb 16, 2015
    Member:
    #973
    Messages:
    4,558
    Gender:
    Male
    First Name:
    Zach
    Eastern Colorado
    Vehicle:
    2008 Desert Sand 5.7L TRD
    In sig
  3. Oct 11, 2018 at 8:42 PM
    #3
    papasmurf

    papasmurf Gun Parts Slinger

    Joined:
    Jan 11, 2017
    Member:
    #5911
    Messages:
    742
    Gender:
    Male
    First Name:
    Bruce
    San Diego
    Vehicle:
    2007 4x4 Tundra
    07 Silver Sky 4x4 |Total Chaos LT | King Coils & Bypasses | ADS Bypasses | Demello Sliders | CB +2 Shackles | OME Dakar Leaf springs | 17" Double Standards | BFGKO2 37's |
    Honesty the gears are not required but a nice to have ... a lift and some trimming and hit the dirt
     
    KevinK and dcsleeper408 like this.
  4. Oct 11, 2018 at 10:30 PM
    #4
    KevinK

    KevinK SGU - High Speed Overlander

    Joined:
    Nov 8, 2016
    Member:
    #5141
    Messages:
    962
    Gender:
    Male
    Gilbert, Arizona
    Vehicle:
    SGU - Speed Glampers Uberfahrt
    Tundras to Sedona
    I have instructions in our build thread. Look in the table of contents for 37s and body mount chop.

    https://www.tundras.com/threads/komodo-my-wifes-daily-driver-and-high-speed-overland-rig.16989/

    It depends very heavily on the offset of your wheels. Too much offset (like 0 or a negative number) makes it super hard to clear on a low lift like we have, 2/1 basically. Around +18 or so is really good.
     
  5. Oct 11, 2018 at 10:36 PM
    #5
    MOTORHEAD

    MOTORHEAD New Member

    Joined:
    Aug 7, 2018
    Member:
    #17866
    Messages:
    11
    Gender:
    Male
    First Name:
    DAVID
    LOS ANGELES CA
    Vehicle:
    2002 Toyota Tundra SR5 V-8 4.7L WHITE
    RCD 6" SUSPENSION LIFT,ICON EXTENDED FRONT COILOVERS,3" BODY LIFT,CAMBURG UPPER CONTROL ARMS.REAR DISK BRAKE CONVERSION,BIG BRAKE FRONT CONVERSION, AND MANY MORE
    you need to re gear your rear end to the correct gear ratio to correct your speedometer ,and also get your engine rpm/powerband to where it should be. it will make your transmission shift properly and also take some of the strain off your drive-line components. the right gear ratio depends on your engine/transmission combination. talk to a rear-end shop.
     
    L3TT3RS [OP] likes this.
  6. Oct 11, 2018 at 11:41 PM
    #6
    L3TT3RS

    L3TT3RS [OP] New Member

    Joined:
    Sep 14, 2018
    Member:
    #19408
    Messages:
    52
    Gender:
    Male
    First Name:
    Taylor
    Vehicle:
    19 cement sr5 crewmax
    Fox 2.5 resi. 35s. Coachbuilder.
    Thanks I will take a look
     
  7. Oct 11, 2018 at 11:58 PM
    #7
    L3TT3RS

    L3TT3RS [OP] New Member

    Joined:
    Sep 14, 2018
    Member:
    #19408
    Messages:
    52
    Gender:
    Male
    First Name:
    Taylor
    Vehicle:
    19 cement sr5 crewmax
    Fox 2.5 resi. 35s. Coachbuilder.
    @KevinK I read through that... that's a lot of cutting. I'll keep that in mind and bookmarked for the future. We will see where I'm at on my 2.75 and 35s. I may be happy as a lark.
     
    KevinK and dcsleeper408 like this.
  8. Oct 12, 2018 at 5:23 AM
    #8
    osidepunker

    osidepunker OsidePunker

    Joined:
    Oct 19, 2016
    Member:
    #4918
    Messages:
    1,251
    Gender:
    Male
    First Name:
    Alex
    SoCal
    Vehicle:
    2013 Tundra DC 4x4
    Full LT, full armor, fully self contained Speed Glamper
    No, you don't.

    And gears wont correct your speedo

    I run 37s with stock gears. The Truck is a dog, but I also weight 8000 lbs. Gears would help bring a little power back and stop the trans from from hunting on the freeway, but they are not a necessity.
     
  9. Oct 12, 2018 at 9:34 AM
    #9
    KevinK

    KevinK SGU - High Speed Overlander

    Joined:
    Nov 8, 2016
    Member:
    #5141
    Messages:
    962
    Gender:
    Male
    Gilbert, Arizona
    Vehicle:
    SGU - Speed Glampers Uberfahrt
    Tundras to Sedona
    Yeah, it seems like a lot when you're reading through it, but it's not actually too bad once you get under there and start doing it. Body mount, pinch weld, front bumper if it's stock, skid plate if it's stock, delete sway bar if it interferes. It's just time consuming to measure, trim, measure, trim, rinse, repeat...
     
    L3TT3RS [OP], joonbug and 831Tun like this.
  10. Oct 12, 2018 at 9:41 AM
    #10
    trayday

    trayday New Member

    Joined:
    Apr 17, 2016
    Member:
    #3163
    Messages:
    602
    Gender:
    Male
    Oregon
    Vehicle:
    2015 limited CM 5.7
    7" BDS, ADS front and rear, Total Chaos UCA's, CB tie rods
    If you go gears with the 37's, a Speedo Calibrator is nice to have for dash gauges. Even with 4.88's and 37's, more mid range TQ would be nice. I have the BAMuffler 8" system, the truck does fine with normal driving and towing 4k lbs but more power would be nice.
     
    L3TT3RS [OP] likes this.
  11. Oct 12, 2018 at 9:49 AM
    #11
    joonbug

    joonbug bacon bastrd

    Joined:
    Oct 13, 2015
    Member:
    #1948
    Messages:
    13,543
    Gender:
    Male
    First Name:
    Joon
    NorCal - Dublin
    Vehicle:
    2015 DC 5.7 TRD off-road
    Get a locker or lsd while you're at it.
     
  12. Oct 14, 2018 at 6:47 AM
    #12
    MOTORHEAD

    MOTORHEAD New Member

    Joined:
    Aug 7, 2018
    Member:
    #17866
    Messages:
    11
    Gender:
    Male
    First Name:
    DAVID
    LOS ANGELES CA
    Vehicle:
    2002 Toyota Tundra SR5 V-8 4.7L WHITE
    RCD 6" SUSPENSION LIFT,ICON EXTENDED FRONT COILOVERS,3" BODY LIFT,CAMBURG UPPER CONTROL ARMS.REAR DISK BRAKE CONVERSION,BIG BRAKE FRONT CONVERSION, AND MANY MORE
    If you re gear the rear end your engine and trans won’t have to work so hard. I changed from a 3:90 ratio to a 4:88 gear. Truck has a lot more power, trans shifts back like it should runs better
     
    L3TT3RS [OP] likes this.

Products Discussed in

To Top